Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment consisted of the following at December 31, 2014 and 2013:

	Estimated Useful Lives	2014		2013
		(in thousands)
Land		$	3,700	$	3,415
Buildings and structures	10 – 40 years		103,341		96,700
Cable and wire	4 – 40 years		201,938		187,293
Equipment and software	2 – 16.7years		366,342		346,072
Plant in service		$	675,321	$	633,480
Plant under construction			18,078		23,181
Total property, plant and equipment			693,399		656,661
Less accumulated amortization and depreciation			287,492		247,698
Property, plant and equipment, net		$	405,907	$	408,963